chemistry

upon cumbustion of a 0.144g sample of Mg, 0.090g of O2 is used. Though the sample likly contains impurites (substance other than Mg). What is the percent of imputities by mass?,

please show the steps I'm really confused with this one.
Thank you

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asked by nelia
  1. I answered this far above.

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    posted by DrBob222

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